Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 16

INDUSTRIAL FINISHING: CORROSION INHIBITORS
Co-blend Technology Working Together
reaction (both oxygen reduction and water reduction), via
blocking the interfacial transfer of electrons.
Removal of toxic warning labels
Sustainability is a key market driver within the coatings
industry. In the past, mandatory regulation was the most
important factor, but now, we are seeing a fundamental
shift in the societal demand with respect to sustainability
and responsible business behaviour. In short, customers are
looking for products that are environmentally sound.
Co-blending existing phosphate-based anticorrosion
systems with Intelli-ion at loadings less than 2.5 per cent
by weight in a paint moves a coating from Environmental
Hazard Classification 2 (H411) to Classification Category
3 (H412). Category 3 presents a lower risk to aquatic life so
no warning label is required on the paint packaging. In turn,
this has storage, transportation, and disposal benefits - not to
mention the environmental advantages.
Cost Savings
Due to the high efficacy and lower loadings - 'smart' co-blend
formulas with other phosphate containing metal salts can
deliver anticorrosive cost savings of 10-30 per cent-per litre
of paint.
In addition, Intelli-ion also has a significantly lower Specific
Gravity than ZnP reducing the need for reformulation changes
when lower weights of anti-corrosives are incorporated.
Inhibitor Compatibility: Independent Academic Research
Figures 1 - 3: depicts the protection mechanism of a co-blended
primer coating following the detection of corrosive ions.
Co-blend Considerations
Zinc phosphate salts on their own are not initially very
effective due mainly to their low solubility. As a result, in a
corrosive environment, significant amounts of time must
pass before there are sufficient concentrations of phosphate
anions to react with the metal surface cations to form an anticorrosive
precipitative layer. This leads to a time delay where
corrosion can proceed unimpeded.
Hexigone's Intelli-ion, distributed by Azelis Canada,
uses 'smart release' technology which senses and reacts to
corrosive ions very quickly-buffering the time delay seen
with phosphate inhibitors. It sequesters corrosive ions which
triggers the release of the 'active ingredient' to form a very fast
inhibitive layer at the site of corrosion. Phosphate inhibitors
then fill the gaps to form a strong polymeric layer with the
metal ions and metal surface. Intelli-ion provides the initial
protection backed up by the zinc phosphate precipitate layer
to provide an optimised co-blend anti-corrosion solution.
Additionally, like highly effective chromates, Intelli-ion
is both an anodic and cathodic inhibitor. This ensures that
the technology can reduce the rate of metal dissolution at the
anode and simultaneously decreases the rate of reduction
16
www.cfcm.ca
Figures 4 and 5 demonstrate Dr. Phil Ansell's research aimed at
understanding the relationship between Intelli-ion and ZnP.
http://www.cfcm.ca
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23

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